From: Vivek Goyal <vgoyal@redhat.com>
To: WANG Chao <chaowang@redhat.com>
Cc: kexec@lists.infradead.org, horms@verge.net.au, linn@hp.com,
hpa@zytor.com, dyoung@redhat.com, trenn@suse.de,
ebiederm@xmission.com
Subject: Re: [PATCH v4 0/4] kexec-tools, x86: E820 memmap pass for kdump
Date: Thu, 27 Mar 2014 18:23:09 -0400 [thread overview]
Message-ID: <20140327222309.GP13816@redhat.com> (raw)
In-Reply-To: <20140327103154.GA2944@dhcp-17-89.nay.redhat.com>
On Thu, Mar 27, 2014 at 06:31:54PM +0800, WANG Chao wrote:
> Hi, Vivek
>
> Sorry for my late response.
>
> On 03/20/14 at 11:42am, Vivek Goyal wrote:
> > On Wed, Mar 19, 2014 at 04:03:57PM +0800, WANG Chao wrote:
> > > Hi, All
> > >
> > > When kaslr comes in and kdump is broken, it seems about the right time to use
> > > E820 instead of memmap=exactmap to pass memmap for kdump for the default memmap
> > > passing mechanism:
> > > http://lists.infradead.org/pipermail/kexec/2014-February/011048.html
> >
> > What's the connection between kaslr and passing memory mappings in
> > bootparams?
>
> kaslr doesn't work with memmap=exactmap. kaslr happens before parsing
> user defined memmap and it walks through E820 in boot_params to
> determine 2nd kernel text area. And it would override the 1st kernel's
> ram.
Ok got it. I forgot about that kaslr is broken with memmap=exactmap. So
this patchset is mandatory for making kexec-tools work with kaslr.
Thanks
Vivek
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prev parent reply other threads:[~2014-03-27 22:23 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 8:03 [PATCH v4 0/4] kexec-tools, x86: E820 memmap pass for kdump WANG Chao
2014-03-19 8:03 ` [PATCH v4 1/4] cleanup: add dbgprint_mem_range function WANG Chao
2014-03-20 3:49 ` Simon Horman
2014-03-19 8:03 ` [PATCH v4 2/4] x86: Store memory ranges globally used for crash kernel to boot into WANG Chao
2014-03-27 22:32 ` Vivek Goyal
2014-03-28 5:23 ` WANG Chao
2014-03-28 14:01 ` Vivek Goyal
2014-03-28 15:44 ` Thomas Renninger
2014-03-28 16:05 ` Vivek Goyal
2014-03-28 2:19 ` Dave Young
2014-03-28 5:36 ` WANG Chao
2014-03-28 3:24 ` Dave Young
2014-03-28 6:13 ` WANG Chao
2014-03-28 6:43 ` Dave Young
2014-03-28 6:51 ` Dave Young
2014-03-28 7:12 ` Dave Young
2014-04-01 7:04 ` WANG Chao
2014-04-01 8:41 ` Dave Young
2014-04-01 8:54 ` WANG Chao
2014-04-01 9:36 ` Dave Young
2014-04-01 9:52 ` WANG Chao
2014-03-19 8:04 ` [PATCH v4 3/4] x86: add --pass-memmap-cmdline option WANG Chao
2014-03-19 8:04 ` [PATCH v4 4/4] x86: Pass memory range via E820 for kdump WANG Chao
2014-03-27 22:50 ` Vivek Goyal
2014-03-28 4:52 ` WANG Chao
2014-03-28 13:53 ` Vivek Goyal
2014-03-28 3:28 ` Dave Young
2014-03-28 4:53 ` WANG Chao
2014-03-19 17:57 ` [PATCH v4 0/4] kexec-tools, x86: E820 memmap pass " Linn Crosetto
2014-03-20 3:50 ` Simon Horman
2014-03-20 5:00 ` WANG Chao
2014-03-20 15:42 ` Vivek Goyal
2014-03-27 10:31 ` WANG Chao
2014-03-27 22:23 ` Vivek Goyal [this message]
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